MORGAN STANLEY DEAN WITTER EQUITY FUND
497, 1999-10-19
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<PAGE>   1
                                                 PROSPECTUS - SEPTEMBER 28, 1999



MORGAN STANLEY DEAN WITTER

[GRAPHIC]

                                                                     EQUITY FUND



                                           A MUTUAL FUND THAT SEEKS TOTAL RETURN



The Securities and Exchange Commission has not approved or disapproved these
securities or passed upon the adequacy of this Prospectus. Any representation to
the contrary is a criminal offense.
<PAGE>   2
CONTENTS

<TABLE>
<CAPTION>
<S>                              <C>                                                                                       <C>
The Fund                         Investment Objective ..................................................................... 1

                                 Principal Investment Strategies .......................................................... 1

                                 Principal Risks .......................................................................... 1

                                 Fees and Expenses ........................................................................ 3

                                 Additional Investment Strategy Information ............................................... 4

                                 Additional Risk Information .............................................................. 4

                                 Fund Management .......................................................................... 5



Shareholder Information          Pricing Fund Shares ...................................................................... 7

                                 How to Buy Shares ........................................................................ 7

                                 How to Exchange Shares ................................................................... 8

                                 How to Sell Shares .......................................................................10

                                 Distributions ............................................................................11

                                 Tax Consequences .........................................................................12

                                 Share Class Arrangements .................................................................12



Financial Highlights             ..........................................................................................19



Our Family of Funds              ...........................................................................Inside Back Cover

                                 This Prospectus contains important information about the Fund.
                                 Please read it carefully and keep it for future reference.
</TABLE>
<PAGE>   3
THE FUND



[TARGET GRAPHIC]            INVESTMENT OBJECTIVE
- ------------------------------------------------
                            Morgan Stanley Dean Witter Equity Fund seeks total
                            return.


[CHESS PIECES]             PRINCIPAL INVESTMENT STRATEGIES
- ----------------------------------------------------------
TOTAL RETURN

An investment
objective having
the goal of
selecting securities
with  the potential
to rise in price
and pay out
income.

                           The Fund will normally invest at least 65% of its
                           total assets in common stock and other equity
                           securities. The Fund's "Sub-Adviser," Miller Anderson
                           & Sherrerd, invests the Fund's assets by pursuing an
                           investing strategy that combines both value and
                           growth styles. The Fund has two teams of portfolio
                           managers: a value team and a growth team. Each
                           manager works independently within the style of his
                           or her specific team. Each team has a team leader who
                           participates in administering the value/growth
                           style-tilt of the portfolio and monitors certain
                           other oversight functions.

                           The Sub-Adviser's investment process is designed to
                           identify growing companies whose stock in the
                           Sub-Adviser's opinion is attractively valued and has
                           low but rising expectations, and to diversify
                           holdings across all market sectors. Individual
                           securities are selected based on, among other
                           things, quantitative screens and fundamental
                           research by in-house industry analysts.

                           Common stock is a share ownership or equity interest
                           in a corporation. It may or may not pay dividends, as
                           some companies reinvest all of their profits back
                           into their businesses, while others pay out some of
                           their profits to shareholders as dividends. A
                           depository receipt is generally issued by a bank or
                           financial institution and represents an ownership
                           interest in the common stock or other equity
                           securities of a foreign company.

                           In addition, the Fund may invest up to 25% of its
                           total assets in foreign securities. This percentage
                           limitation, however, does not apply to securities of
                           foreign companies (including depository receipts)
                           that are listed in the U.S. on a national securities
                           exchange. The Fund also may invest in convertible and
                           fixed-income securities.

                           In pursuing the Fund's investment objective, the
                           Sub-Adviser has considerable leeway in deciding which
                           investments it buys, holds or sells on a day-to-day
                           basis -- and which trading strategies it uses. For
                           example, the Sub-Adviser in its discretion may
                           determine to use some permitted trading strategies
                           while not using others.


[SCALE GRAPHIC]            PRINCIPAL RISKS
- ------------------------------------------
                           There is no assurance that the Fund will achieve its
                           investment objective. The Fund's share price will
                           fluctuate with changes in the market value of the
                           Fund's portfolio securities. When you sell Fund
                           shares, they may be worth less than what you paid for
                           them and, accordingly, you can lose money investing
                           in this Fund.

                           Common Stocks. A principal risk of investing in the
                           Fund is associated with its common stock investments.
                           In general, stock values fluctuate in response to
                           activities specific to the company as well as general
                           market, economic and political conditions. Stock
                           prices can fluctuate widely in response to these
                           factors.

                           Foreign Securities. The Fund's investments in foreign
                           securities (including depository receipts) may
                           involve risks in addition to the risks associated
                           with domestic securities. One additional risk is
                           currency risk. While the price of Fund shares is
                           quoted in U.S. dollars, the Fund generally converts
                           U.S. dollars to a foreign market's local currency to
                           purchase a security in that market. If the value of
                           that local currency falls relative to the U.S.
                           dollar, the U.S. dollar value of the foreign security
                           will decrease. This is true even if the foreign
                           security's local price remains unchanged.

                                                                               1
<PAGE>   4
                           Foreign securities also have risks related to
                           economic and political developments abroad, including
                           expropriations, confiscatory taxation, exchange
                           control regulation, limitations on the use or
                           transfer of Fund assets and any effects of foreign
                           social, economic or political instability. Foreign
                           companies, in general, are not subject to the
                           regulatory requirements of U.S. companies and, as
                           such, there may be less publicly available
                           information about these companies. Moreover, foreign
                           accounting, auditing and financial reporting
                           standards generally are different from those
                           applicable to U.S. companies. Finally, in the event
                           of a default of any foreign debt obligations, it may
                           be more difficult for the Fund to obtain or enforce a
                           judgment against the issuers of the securities.

                           Securities of foreign issuers may be less liquid than
                           comparable securities of U.S. issuers and, as such,
                           their price changes may be more volatile.
                           Furthermore, foreign exchanges and broker-dealers are
                           generally subject to less government and exchange
                           scrutiny and regulation than their U.S. counterparts.
                           In addition, differences in clearance and settlement
                           procedures in foreign markets may occasion delays in
                           settlements of the Fund's trades effected in those
                           markets and could result in losses to the Fund due to
                           subsequent declines in the value of the securities
                           subject to the trades.

                           Many European countries have adopted or are in the
                           process of adopting a single European currency,
                           referred to as the "euro." The consequences of the
                           euro conversion for foreign exchange rates, interest
                           rates and the value of European securities the Fund
                           may purchase are presently unclear. The consequences
                           may adversely affect the value and/or increase the
                           volatility of securities held by the Fund.

                           Other Risks. The performance of the Fund also will
                           depend on whether the Sub-Adviser is successful in
                           pursuing the Fund's investment strategy. The Fund is
                           subject to other risks from its permissible
                           investments including the risks associated with
                           convertible and fixed-income securities. For more
                           information about these risks, see the "Additional
                           Risk Information" section.

                           Shares of the Fund are not bank deposits and are not
                           guaranteed or insured by the FDIC or any other
                           government agency.

2
<PAGE>   5
[MONEY GRAPHIC]            FEES AND EXPENSES
- --------------------------------------------
                           The table below briefly describes the fees and
                           expenses that you may pay if you buy and hold shares
                           of the Fund. The Fund offers four classes of shares:
                           Classes A, B, C and D. Each Class has a different
                           combination of fees, expenses and other features. The
                           Fund does not charge account or exchange fees. See
                           the "Share Class Arrangements" section for further
                           fee and expense information.

<TABLE>
<CAPTION>
                                                                               CLASS A      CLASS B       CLASS C      CLASS D
                           ---------------------------------------------------------------------------------------------------
<S>                        <C>                                                 <C>           <C>           <C>           <C>
SHAREHOLDER FEES           SHAREHOLDER FEES
These fees are paid        ---------------------------------------------------------------------------------------------------
directly from your         Maximum sales charge (load) imposed on
investment.                purchases (as a percentage of offering price)       5.25%(1)      None          None          None
                           ---------------------------------------------------------------------------------------------------
                           Maximum deferred sales charge (load) (as a
                           percentage based on the lesser of the offering
ANNUAL FUND                price or net asset value at redemption)             None(2)       5.00%(3)      1.00%(4)      None
OPERATING EXPENSES         ---------------------------------------------------------------------------------------------------
These expenses are         ANNUAL FUND OPERATING EXPENSES
deducted from the Fund's   ---------------------------------------------------------------------------------------------------
assets and are based on    Management fee                                      0.85%         0.85%         0.85%         0.85%
expenses paid for the      ---------------------------------------------------------------------------------------------------
period July 29, 1998       Distribution and service (12b-1) fees               0.25%         1.00%         0.78%         None
through May 31, 1999.      ---------------------------------------------------------------------------------------------------
                           Other expenses(5)                                   0.28%         0.28%         0.28%         0.28%
                           ---------------------------------------------------------------------------------------------------
                           Total annual Fund operating expenses                1.38%         2.13%         1.91%         1.13%
                           ---------------------------------------------------------------------------------------------------
</TABLE>


                           (1) Reduced for purchases of $25,000 and over.

                           (2) Investments that are not subject to any sales
                               charge at the time of purchase are subject to a
                               contingent deferred sales charge ("CDSC") of
                               1.00% that will be imposed if you sell your
                               shares within one year after purchase, except for
                               certain specific circumstances.

                           (3) The CDSC is scaled down to 1.00% during the sixth
                               year, reaching zero thereafter. See "Share Class
                               Arrangements" for a complete discussion of the
                               CDSC.

                           (4) Only applicable if you sell your shares within
                               one year after purchase.

                           (5) "Other Expenses" are estimated based on expenses
                               anticipated for the first complete fiscal year of
                               the Fund.

                           Example

                           This example is intended to help you compare the cost
                           of investing in the Fund with the cost of investing
                           in other mutual funds.

                           The example assumes that you invest $10,000 in the
                           Fund, your investment has a 5% return each year, and
                           the Fund's operating expenses remain the same.
                           Although your actual costs may be higher or lower,
                           the tables below show your costs at the end of each
                           period based on these assumptions depending upon
                           whether or not you sell your shares at the end of
                           each period.

                           IF YOU SOLD YOUR SHARES:

<TABLE>
<CAPTION>
                                       1 YEAR   3 YEARS
                           ----------------------------
<S>                                     <C>       <C>
                           Class A      $658      $939

                           Class B      $716      $967

                           Class C      $294      $601

                           Class D      $115      $360
</TABLE>

                           IF YOU HELD YOUR SHARES:

<TABLE>
<CAPTION>
                                       1 YEAR   3 YEARS
                           ----------------------------
<S>                                    <C>      <C>
                           Class A      $658      $939

                           Class B      $216      $667

                           Class C      $194      $601

                           Class D      $115      $360
</TABLE>

Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.


                                                                               3
<PAGE>   6
[CHESS PIECES GRAPHIC]     ADDITIONAL INVESTMENT STRATEGY INFORMATION
- ---------------------------------------------------------------------
                           This section provides additional information relating
                           to the Fund's principal strategies.

                           Convertible and Fixed-Income Securities. The Fund may
                           invest up to 35% of its total assets in (i)
                           convertible securities (which may be rated below
                           investment grade commonly known as "junk bonds"),
                           (ii) investment grade fixed-income securities of
                           domestic and foreign companies and governments and
                           international organizations, and (iii) U.S.
                           government securities.

                           Defensive Investing. The Fund may take temporary
                           "defensive" positions in attempting to respond to
                           adverse market conditions. The Fund may invest any
                           amount of its total assets in cash or money market
                           instruments in a defensive posture when the
                           Investment Manager believes it is advisable to do so.
                           Although taking a defensive posture is designed to
                           protect the Fund from an anticipated market downturn,
                           it could have the effect of reducing the benefit from
                           any upswing in the market. When the Fund takes a
                           defensive position, it may not achieve its investment
                           objective.

                           Portfolio Turnover. The Fund may engage in active and
                           frequent trading of portfolio securities to achieve
                           its principal investment strategies. The portfolio
                           turnover rate is not expected to exceed 200% annually
                           under normal circumstances. A high turnover rate,
                           such as 200%, will increase Fund brokerage costs. It
                           also may increase the Fund's capital gains, which are
                           passed along to Fund shareholders as distributions.
                           This, in turn, may increase your tax liability as a
                           Fund shareholder. See the sections on "Distributions"
                           and "Tax Consequences."

                           The percentage limitations relating to the
                           composition of the Fund's portfolio apply at the time
                           the Fund acquires an investment and refer to the
                           Fund's net assets unless otherwise noted. Subsequent
                           percentage changes that result from market
                           fluctuations will not require the Fund to sell any
                           portfolio security. The Fund may change its principal
                           investment strategies without shareholder approval;
                           however, you would be notified of any changes.


[SCALE GRAPHIC]            ADDITIONAL RISK INFORMATION
- ------------------------------------------------------
                           This section provides additional information relating
                           to the principal risks of investing in the Fund.

                           Convertible Securities. The Fund's investments in
                           convertible securities subject the Fund to the risks
                           associated with both fixed-income securities and
                           common stocks. To the extent that a convertible
                           security's investment value is greater than its
                           conversion value, its price will likely increase when
                           interest rates fall and decrease when interest rates
                           rise, as with a fixed-income security. If the
                           conversion value exceeds the investment value, the
                           price of the convertible security will tend to
                           fluctuate directly with the price of the underlying
                           equity security. The convertible securities in which
                           the Fund may invest may be below investment grade.
                           Securities below investment grade are commonly known
                           as "junk bonds" and have speculative characteristics.

                           Fixed-Income Securities. All fixed-income securities
                           are subject to two types of risk: credit risk and
                           interest rate risk. Credit risk refers to the
                           possibility that the issuer of a security will be
                           unable to make interest payments and/or repay the

4
<PAGE>   7
                           principal on its debt. While the Fund invests in
                           investment grade fixed-income securities, certain of
                           these securities have speculative characteristics.

                           Interest rate risk refers to fluctuations in the
                           value of a fixed-income security resulting from
                           changes in the general level of interest rates. When
                           the general level of interest rate goes up, the
                           prices of most fixed-income securities goes down.
                           When the general level of interest rates goes down,
                           the prices of most fixed-income securities goes up.
                           Accordingly, a rise in the general level of interest
                           rates may cause the price of the Fund's fixed-income
                           securities to fall substantially.

                           Year 2000. The Fund could be adversely affected if
                           the computer systems necessary for the efficient
                           operation of the Fund's "Investment Manager," Morgan
                           Stanley Dean Witter Advisors, Inc., the Sub-Adviser,
                           the Fund's other service providers and the markets
                           and corporate and governmental issuers in which the
                           Fund invests do not properly process and calculate
                           date-related information from and after January 1,
                           2000. While year 2000-related computer problems could
                           have a negative effect on the Fund, the Investment
                           Manager, the Sub-Adviser and their affiliates are
                           working hard to avoid any problems and to obtain
                           assurances from their service providers that they are
                           taking similar steps.

                           In addition, it is possible that the markets for
                           securities in which the Fund invests may be
                           detrimentally affected by computer failures
                           throughout the financial services industry beginning
                           January 1, 2000. Improperly functioning trading
                           systems may result in settlement problems and
                           liquidity issues. In addition, corporate and
                           governmental data processing errors also may result
                           in production problems for individual companies and
                           overall economic uncertainties. Earnings of
                           individual issuers will be affected by remediation
                           costs, which may be substantial and may be reported
                           inconsistently in U.S. and foreign financial
                           statements. Accordingly, the Fund's investments may
                           be adversely affected.


[FACES GRAPHIC]            FUND MANAGEMENT
- ------------------------------------------
MORGAN STANLEY DEAN
WITTER ADVISORS INC.

The Investment Manager is
widely recognized as a
leader in the mutual fund
industry and together
with Morgan Stanley Dean
Witter Services Company
Inc., its wholly-owned
subsidiary, has more than
$136 billion in assets
under management or
administration as of
August 31, 1999.

                           The Fund has retained the Investment Manager --
                           Morgan Stanley Dean Witter Advisors Inc. -- to
                           provide administrative services and manage its
                           business affairs. The Investment Manager has, in
                           turn, contracted with the Sub-Adviser -- Miller
                           Anderson & Sherrerd, LLP - to invest the Fund's
                           assets, including the placing of orders for the
                           purchase and sale of portfolio securities. The
                           Investment Manager is a wholly-owned subsidiary of
                           Morgan Stanley Dean Witter & Co., a preeminent global
                           financial services firm that maintains leading market
                           positions in each of its three primary businesses:
                           securities, asset management and credit services. Its
                           main business office is located at Two World Trade
                           Center, New York, New York 10048.

                           The Sub-Adviser manages assets of approximately $62.4
                           billion as of March 31, 1999 for investment
                           companies, employee benefit plans, endowments,
                           foundation and other institutional investors. The
                           Sub-Adviser is an indirect subsidiary of Morgan
                           Stanley Dean Witter & Co. The Sub-Adviser's address
                           is One Tower Bridge, West Conshohocken, Pennsylvania.

                           The portfolio managers, currently six in total, are
                           divided into two teams: a value team and a growth
                           team. Each team has three members: one member of each
                           team serves as the designated team leader. The value
                           team includes Nicholas J. Kovich, James Jolinger and
                           Robert J. Marcin. The growth team includes Arden C.
                           Armstrong, Brian Kramp and Gary G. Schlarbaum. Mr.
                           Kovich and Mr. Kramp are the

                                                                               5
<PAGE>   8
                           respective team leaders. Ms. Armstrong, Mr. Kovich,
                           Mr. Marcin and Mr. Schlarbaum are Managing Directors
                           of the Sub-Adviser and have been managing portfolios
                           for the Sub-Adviser for over five years. Mr. Jolinger
                           is a Principal of the Sub-Adviser and the Director of
                           Research; he has been associated with the Sub-Adviser
                           since 1994 and prior to that was an equity analyst
                           with Oppenheimer Capital (1987-1994). Mr. Kramp is a
                           Vice President of the Sub-Adviser and has been
                           affiliated with the Sub-Adviser since 1997; prior to
                           that he was an analyst/portfolio manager with
                           Meridian Investment Company (1984-1997).

                           The Fund pays the Investment Manager a monthly
                           management fee as full compensation for the services
                           and facilities furnished to the Fund, and for Fund
                           expenses assumed by the Investment Manager. The fee
                           is calculated at the annual rate of 0.85%. The
                           Investment Manager pays the Sub-Adviser compensation
                           equal to 40% of its compensation for services and
                           facilities furnished to the Fund.


6
<PAGE>   9
SHAREHOLDER INFORMATION



[MONEY GRAPHIC]            PRICING FUND SHARES
- ----------------------------------------------
                           The price of Fund shares (excluding sales charges),
                           called "net asset value," is based on the value of
                           the Fund's portfolio securities. While the assets of
                           each Class are invested in a single portfolio of
                           securities, the net asset value of each Class will
                           differ because the Classes have different ongoing
                           distribution fees.

                           The net asset value per share of the Fund is
                           determined once daily at 4:00 p.m. Eastern time, on
                           each day that the New York Stock Exchange is open
                           (or, on days when the New York Stock Exchange closes
                           prior to 4:00 p.m., at such earlier time). Shares
                           will not be priced on days that the New York Stock
                           Exchange is closed.

                           The value of the Fund's portfolio securities is based
                           on the securities' market price when available. When
                           a market price is not readily available, including
                           circumstances under which the Investment Manager
                           and/or Sub-Adviser determine that a security's market
                           price is not accurate, a portfolio security is valued
                           at its fair value, as determined under procedures
                           established by the Fund's Board of Trustees. In these
                           cases, the Fund's net asset value will reflect
                           certain portfolio securities' fair value rather than
                           their market price. In addition, if the Fund holds
                           securities primarily listed on foreign exchanges, the
                           value of the Fund's portfolio securities may change
                           on days when you will not be able to purchase or sell
                           your shares.

                           An exception to the Fund's general policy of using
                           market prices concerns its short-term debt portfolio
                           securities. Debt securities with remaining maturities
                           of sixty days or less at the time of purchase are
                           valued at amortized cost. However, if the cost does
                           not reflect the securities' market value, these
                           securities will be valued at their fair value.


[HANDSHAKE GRAPHIC]        HOW TO BUY SHARES
- --------------------------------------------
CONTACTING A
FINANCIAL ADVISOR

If you are new to the
Morgan Stanley Dean
Witter Family of Funds
and would like to contact
a Financial Advisor, call
(800) THE-DEAN for the
telephone number of the
Morgan Stanley Dean
Witter office nearest
you. You may also access
our office locator on our
Internet site at:
www.msdw.com/
individual/funds

                           You may open a new account to buy Fund shares or buy
                           additional Fund shares for an existing account by
                           contacting your Morgan Stanley Dean Witter Financial
                           Advisor or other authorized financial representative.
                           Your Financial Advisor will assist you, step-by-step,
                           with the procedures to invest in the Fund. You may
                           also purchase shares directly by calling the Fund's
                           transfer agent and requesting an application.

                           Because every investor has different immediate
                           financial needs and long-term investment goals, the
                           Fund offers investors four Classes of shares: Classes
                           A, B, C and D. Class D shares are only offered to a
                           limited group of investors. Each Class of shares
                           offers a distinct structure of sales charges,
                           distribution and service fees, and other features
                           that are designed to address a variety of needs. Your
                           Financial Advisor or other authorized financial
                           representative can help you decide which Class may be
                           most appropriate for you. When purchasing Fund
                           shares, you must specify which Class of shares you
                           wish to purchase.

                           When you buy Fund shares, the shares are purchased at
                           the next share price calculated, less any applicable
                           front-end sales charge, after we receive your
                           purchase order. Your payment is due on the third
                           business day after you place your purchase order. We
                           reserve the right to reject any order for the
                           purchase of Fund shares.


7
<PAGE>   10
EASYINVEST(SM)

A purchase plan that
allows you to transfer
money automatically from
your checking or savings
account or from a Money
Market Fund on a
semi-monthly, monthly or
quarterly basis. Contact
your Morgan Stanley Dean
Witter Financial Advisor
for further information
about this service.

<TABLE>
<CAPTION>
                           MINIMUM INVESTMENT AMOUNTS
                           ------------------------------------------------------------------------------------------
                                                                                              MINIMUM INVESTMENT
                                                                                         ----------------------------
                           INVESTMENT OPTIONS                                            INITIAL           ADDITIONAL
                           ------------------------------------------------------------------------------------------
<S>                                                       <C>                            <C>                 <C>
                           Regular Accounts                                              $1,000              $100
                           ------------------------------------------------------------------------------------------
                           Individual Retirement
                           Accounts:                      Regular IRAs                   $1,000              $100

                                                          Education IRAs                  $500               $100
                           ------------------------------------------------------------------------------------------
                           EasyInvest(SM)                 (Automatically from
                                                          your checking or
                                                          savings account or
                                                          Money Market Fund)              $100*              $100*
                           ------------------------------------------------------------------------------------------
</TABLE>
                           * Provided your schedule of investments totals $1,000
                           in twelve months.

                           There is no minimum investment amount if you purchase
                           Fund shares through: (1) the Investment Manager's
                           mutual fund asset allocation plan, (2) a program,
                           approved by the Fund's distributor, in which you pay
                           an asset-based fee for advisory, administrative
                           and/or brokerage services, or (3) employer-sponsored
                           employee benefit plan accounts.

                           INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND
                           OTHER INVESTORS/CLASS D SHARES. To be eligible to
                           purchase Class D shares, you must qualify under one
                           of the investor categories specified in the "Share
                           Class Arrangements" section of this Prospectus.

                           SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In
                           addition to buying additional Fund shares for an
                           existing account by contacting your Morgan Stanley
                           Dean Witter Financial Advisor, you may send a check
                           directly to the Fund. To buy additional shares in
                           this manner:

                           -   Write a "letter of instruction" to the Fund
                               specifying the name(s) on the account, the
                               account number, the social security or tax
                               identification number, the Class of shares you
                               wish to purchase, and the investment amount
                               (which would include any applicable front-end
                               sales charge). The letter must be signed by the
                               account owner(s).

                           -   Make out a check for the total amount payable to:
                               Morgan Stanley Dean Witter Equity Fund.

                           -   Mail the letter and check to Morgan Stanley Dean
                               Witter Trust FSB at P.O. Box 1040, Jersey City,
                               NJ 07303.


[ARROWS GRAPHIC]           HOW TO EXCHANGE SHARES

                           PERMISSIBLE FUND EXCHANGES. You may exchange shares
                           of any Class of the Fund for the same Class of any
                           other continuously offered Multi-Class Fund, or for
                           shares of a No-Load Fund, Money Market Fund, North
                           American Government Income Trust or Short-Term U.S.
                           Treasury Trust, without the imposition of an exchange
                           fee. See the inside back cover of this Prospectus for
                           each Morgan Stanley Dean Witter Fund's designation as
                           a Multi-Class Fund, No-Load Fund or Money Market
                           Fund. If a Morgan Stanley Dean Witter Fund is not
                           listed, consult the inside back cover of that Fund's
                           Prospectus for its designation. For purposes of
                           exchanges, shares of FSC Funds (subject to a
                           front-end sales charge) are treated as Class A shares
                           of a Multi-Class Fund.

                           Exchanges may be made after shares of the Fund
                           acquired by purchase have been held for thirty days.
                           There is no waiting period for exchanges of shares
                           acquired by exchange or dividend reinvestment. The
                           current prospectus for each fund describes its
                           investment objective(s), policies and investment
                           minimum, and should be read before investment. Since
                           exchanges are available only into continuously
                           offered Morgan Stanley Dean Witter Funds, exchanges
                           are not available into any new

8
<PAGE>   11
                           Morgan Stanley Dean Witter Fund during its initial
                           offering period, or when shares of a Morgan Stanley
                           Dean Witter Fund are not being offered for purchase.

                           EXCHANGE PROCEDURES. You can process an exchange by
                           contacting your Morgan Stanley Dean Witter Financial
                           Advisor or other authorized financial representative.
                           Otherwise, you must forward an exchange privilege
                           authorization form to the Fund's transfer agent --
                           Morgan Stanley Dean Witter Trust FSB -- and then
                           write the transfer agent or call (800) 869-NEWS to
                           place an exchange order. You can obtain an exchange
                           privilege authorization form by contacting your
                           Financial Advisor or other authorized financial
                           representative or by calling (800) 869-NEWS. If you
                           hold share certificates, no exchanges may be
                           processed until we have received all applicable share
                           certificates.

                           An exchange to any Morgan Stanley Dean Witter Fund
                           (except a Money Market Fund) is made on the basis of
                           the next calculated net asset values of the Funds
                           involved after the exchange instructions are
                           accepted. When exchanging into a Money Market Fund,
                           the Fund's shares are sold at their next calculated
                           net asset value and the Money Market Fund's shares
                           are purchased at their net asset value on the
                           following business day.

                           The Fund may terminate or revise the exchange
                           privilege upon required notice. The check writing
                           privilege is not available for Money Market Fund
                           shares you acquire in an exchange.

                           TELEPHONE EXCHANGES. For your protection when calling
                           Morgan Stanley Dean Witter Trust FSB, we will employ
                           reasonable procedures to confirm that exchange
                           instructions communicated over the telephone are
                           genuine. These procedures may include requiring
                           various forms of personal identification such as
                           name, mailing address, social security or other tax
                           identification number. Telephone instructions also
                           may be recorded.

                           Telephone instructions will be accepted if received
                           by the Fund's transfer agent between 9:00 a.m. and
                           4:00 p.m. Eastern time, on any day the New York Stock
                           Exchange is open for business. During periods of
                           drastic economic or market changes, it is possible
                           that the telephone exchange procedures may be
                           difficult to implement, although this has not been
                           the case with the Fund in the past.

                           MARGIN ACCOUNTS. If you have pledged your Fund shares
                           in a margin account, contact your Morgan Stanley Dean
                           Witter Financial Advisor or other authorized
                           financial representative regarding restrictions on
                           the exchange of such shares.

                           TAX CONSIDERATIONS OF EXCHANGES. If you exchange
                           shares of the Fund for shares of another Morgan
                           Stanley Dean Witter Fund there are important tax
                           considerations. For tax purposes, the exchange out of
                           the Fund is considered a sale of the Fund's shares --
                           and the exchange into the other Fund is considered a
                           purchase. As a result, you may realize a capital gain
                           or loss.

                           You should review the "Tax Consequences" section and
                           consult your own tax professional about the tax
                           consequences of an exchange.

                           FREQUENT EXCHANGES. A pattern of frequent exchanges
                           may result in the Fund limiting or prohibiting, at
                           its discretion, additional purchases and/or
                           exchanges. The Fund will notify you in advance of
                           limiting your exchange privileges.

                           CDSC CALCULATIONS ON EXCHANGES. See the "Share Class
                           Arrangements" section of this Prospectus for a
                           discussion of how applicable contingent deferred
                           sales charges (CDSCs) are calculated for shares of
                           one Morgan Stanley Dean Witter Fund that are
                           exchanged for shares of another.

                           For further information regarding exchange
                           privileges, you should contact your Morgan Stanley
                           Dean Witter Financial Advisor or call (800) 869-NEWS.

                                                                               9
<PAGE>   12
[HANDSHAKE GRAPHIC]        HOW TO SELL SHARES
- ---------------------------------------------
                           You can sell some or all of your Fund shares at any
                           time. If you sell Class A, Class B or Class C shares,
                           your net sale proceeds are reduced by the amount of
                           any applicable CDSC. Your shares will be sold at the
                           next price calculated after we receive your order to
                           sell as described below.

<TABLE>
<CAPTION>
                           OPTIONS                     PROCEDURES
                           --------------------------------------------------------------------------------------------
<S>                                                    <C>
                           Contact Your                To sell your shares, simply call your Morgan Stanley Dean Witter
                           Financial Advisor           Financial Advisor or other authorized financial representative.
                           [PHONE GRAPHIC]
                                                      ------------------------------------------------------------------
                                                       Payment will be sent to the address to which the account is
                                                       registered or deposited in your brokerage account.
                           --------------------------------------------------------------------------------------------
                           By Letter                   You can also sell your shares by writing a "letter of
                           [LETTER GRAPHIC]            instruction" that includes:
                                                       - your account number;
                                                       - the dollar amount or the number of shares you wish to sell;
                                                       - the Class of shares you wish to sell; and
                                                       - the signature of each owner as it appears on the account.
                                                      ------------------------------------------------------------------
                                                       If you are requesting payment to anyone other than the registered
                                                       owner(s) or that payment be sent to any address other than the
                                                       address of the registered owner(s) or pre-designated bank
                                                       account, you will need a signature guarantee. You can obtain a
                                                       signature guarantee from an eligible guarantor acceptable to
                                                       Morgan Stanley Dean Witter Trust FSB. (You should contact Morgan
                                                       Stanley Dean Witter Trust FSB at (800) 869-NEWS for a
                                                       determination as to whether a particular institution is an
                                                       eligible guarantor.) A notary public cannot provide a signature
                                                       guarantee. Additional documentation may be required for shares
                                                       held by a corporation, partnership, trustee or executor.
                                                      ------------------------------------------------------------------
                                                       Mail the letter to Morgan Stanley Dean Witter Trust FSB at P.O.
                                                       Box 983, Jersey City, New Jersey 07303. If you hold share
                                                       certificates, you must return the certificates, along with the
                                                       letter and any required additional documentation.
                                                      ------------------------------------------------------------------
                                                       A check will be mailed to the name(s) and address in which the
                                                       account is registered, or otherwise according to your
                                                       instructions.
                           --------------------------------------------------------------------------------------------
                           SYSTEMATIC                  If your investment in all of the Morgan Stanley Dean Witter
                           WITHDRAWAL PLAN             Family of Funds has a total market value of at least $10,000, you
                           [ARROWS GRAPHIC]            may elect to withdraw amounts of $25 or more, or in any whole
                                                       percentage of a Fund's balance (provided the amount is at least
                                                       $25), on a monthly, quarterly, semi-annual or annual basis, from
                                                       any Fund with a balance of at least $1,000. Each time you add a
                                                       Fund to the plan, you must meet the plan requirements.
                                                      ------------------------------------------------------------------
                                                       Amounts withdrawn are subject to any applicable CDSC. A CDSC may
                                                       be waived under certain circumstances. See the Class B waiver
                                                       categories listed in the "Share Class Arrangements" section of
                                                       this Prospectus.
                                                      ------------------------------------------------------------------
                                                       To sign up for the systematic withdrawal plan, contact your
                                                       Morgan Stanley Dean Witter Financial Advisor or call (800)
                                                       869-NEWS. You may terminate or suspend your plan at any time.
                                                       Please remember that withdrawals from the plan are sales of
                                                       shares, not Fund "distributions," and ultimately may exhaust your
                                                       account balance. The Fund may terminate or revise the plan at any
                                                       time.
                           --------------------------------------------------------------------------------------------
</TABLE>
                           PAYMENT FOR SOLD SHARES. After we receive your
                           complete instructions to sell as described above, a
                           check will be mailed to you within seven days,
                           although we will attempt to make payment within one
                           business day. Payment may also be sent to your
                           brokerage account.

                           Payment may be postponed or the right to sell your
                           shares suspended under unusual circumstances. If you
                           request to sell shares that were recently purchased
                           by check, payment of the sale proceeds may be delayed
                           for the minimum time needed to verify that the check
                           has been honored (not more than fifteen days from the
                           time we receive the check).

10
<PAGE>   13
                           TAX CONSIDERATIONS. Normally, your sale of Fund
                           shares is subject to federal and state income tax.
                           You should review the "Tax Consequences" section of
                           this Prospectus and consult your own tax professional
                           about the tax consequences of a sale.

                           REINSTATEMENT PRIVILEGE. If you sell Fund shares and
                           have not previously exercised the reinstatement
                           privilege, you may, within 35 days after the date of
                           sale, invest any portion of the proceeds in the same
                           Class of Fund shares at their net asset value and
                           receive a pro rata credit for any CDSC paid in
                           connection with the sale.

                           INVOLUNTARY SALES. The Fund reserves the right, on
                           sixty days' notice, to sell the shares of any
                           shareholder (other than shares held in an IRA or
                           403(b) Custodial Account) whose shares, due to sales
                           by the shareholder, have a value below $100, or in
                           the case of an account opened through EasyInvest(SM),
                           if after 12 months the shareholder has invested less
                           than $1,000 in the account.

                           However, before the Fund sells your shares in this
                           manner, we will notify you and allow you sixty days
                           to make an additional investment in an amount that
                           will increase the value of your account to at least
                           the required amount before the sale is processed. No
                           CDSC will be imposed on any involuntary sale.

                           MARGIN ACCOUNTS. If you have pledged your Fund shares
                           in a margin account, contact your Morgan Stanley Dean
                           Witter Financial Advisor or other authorized
                           financial representative regarding restrictions on
                           the sale of such shares.


[CHECKMARK GRAPHIC]        DISTRIBUTIONS
- ----------------------------------------
                           The Fund passes substantially all of its earnings
                           from income and capital gains along to its investors
                           as "distributions." The Fund earns income from stocks
                           and interest from fixed-income investments. These
                           amounts are passed along to Fund shareholders as
                           "income dividend distributions." The Fund realizes
                           capital gains whenever it sells securities for a
                           higher price than it paid for them. These amounts may
                           be passed along as "capital gain distributions."

                           The Fund declares income dividends separately for
                           each Class. Distributions paid on Class A and Class D
                           shares will be higher than for Class B and Class C
                           because distribution fees that Class B and Class C
                           pay are higher. Normally, income dividends are
                           distributed annually. Capital gains, if any, are
                           usually distributed in December.

                           The Fund, however, may retain and reinvest any
                           long-term capital gains. The Fund may at times make
                           payments from sources other than income or capital
                           gains that represent a return of a portion of your
                           investment.

                           Distributions are reinvested automatically in
                           additional shares of the same Class and automatically
                           credited to your account, unless you request in
                           writing that all distributions be paid in cash. If
                           you elect the cash option, the Fund will mail a check
                           to you no later than seven business days after the
                           distribution is declared. No interest will accrue on
                           uncashed checks. If you wish to change how your
                           distributions are paid, your request should be
                           received by the Fund's transfer agent, Morgan Stanley
                           Dean Witter Trust FSB, at least five business days
                           prior to the record date of the distributions.

TARGETED DIVIDENDS(SM)

You may select to have
your Fund distributions
automatically invested in
other Classes of Fund
shares or Classes of
another Morgan Stanley
Dean Witter Fund that you
own. Contact your Morgan
Stanley Dean Witter
Financial Advisor for
further information about
this service.

                                                                              11
<PAGE>   14
[1040 GRAPHIC]             TAX CONSEQUENCES
- -------------------------------------------
                           As with any investment, you should consider how your
                           Fund investment will be taxed. The tax information in
                           this Prospectus is provided as general information.
                           You should consult your own tax professional about
                           the tax consequences of an investment in the Fund.

                           Unless your investment in the Fund is through a
                           tax-deferred retirement account, such as a 401(k)
                           plan or IRA, you need to be aware of the possible tax
                           consequences when:

                           -   The Fund makes distributions; and

                           -   You sell Fund shares, including an exchange to
                               another Morgan Stanley Dean Witter Fund.

                           Taxes on Distributions. Your distributions are
                           normally subject to federal and state income tax when
                           they are paid, whether you take them in cash or
                           reinvest them in Fund shares. A distribution also may
                           be subject to local income tax. Any income dividend
                           distributions and any short-term capital gain
                           distributions are taxable to you as ordinary income.
                           Any long-term capital gain distributions are taxable
                           as long-term capital gains, no matter how long you
                           have owned shares in the Fund.

                           Every January, you will be sent a statement (IRS Form
                           1099-DIV) showing the taxable distributions paid to
                           you in the previous year. The statement provides full
                           information on your dividends and capital gains for
                           tax purposes.

                           Taxes on Sales. Your sale of Fund shares normally is
                           subject to federal and state income tax and may
                           result in a taxable gain or loss to you. A sale also
                           may be subject to local income tax. Your exchange of
                           Fund shares for shares of another Morgan Stanley Dean
                           Witter Fund is treated for tax purposes like a sale
                           of your original shares and a purchase of your new
                           shares. Thus, the exchange may, like a sale, result
                           in a taxable gain or loss to you and will give you a
                           new tax basis for your new shares.

                           When you open your Fund account, you should provide
                           your Social Security or tax identification number on
                           your investment application. By providing this
                           information, you will avoid being subject to a
                           federal backup withholding tax of 31% on taxable
                           distributions and redemption proceeds. Any withheld
                           amount would be sent to the IRS as an advance tax
                           payment.


[BLOCKS GRAPHIC]           SHARE CLASS ARRANGEMENTS
- ---------------------------------------------------
                           The Fund offers several Classes of shares having
                           different distribution arrangements designed to
                           provide you with different purchase options according
                           to your investment needs. Your Morgan Stanley Dean
                           Witter Financial Advisor or other authorized
                           financial representative can help you decide which
                           Class may be appropriate for you.

                           The general public is offered three Classes: Class A
                           shares, Class B shares and Class C shares, which
                           differ principally in terms of sales charges and
                           ongoing expenses. A fourth Class, Class D shares, is
                           offered only to a limited category of investors.
                           Shares that you acquire through reinvested
                           distributions will not be subject to any front-end
                           sales charge or CDSC -- contingent deferred sales
                           charge. Sales personnel may receive different
                           compensation for selling each Class of shares. The
                           sales charges applicable to each Class provide for
                           the distribution financing of shares of that Class.

12
<PAGE>   15
                           The chart below compares the sales charge and the
                           maximum annual 12b-1 fees applicable to each Class:


<TABLE>
<CAPTION>
                                                                                                               MAXIMUM
                             CLASS     SALES CHARGE                                                        ANNUAL 12b-1 FEE
                           ------------------------------------------------------------------------------------------------
<S>                                    <C>                                                                 <C>
                             A         Maximum 5.25% initial sales charge reduced for purchase of
                                       $25,000 or more; shares sold without an initial sales charge are
                                       generally subject to a 1.0% CDSC during first year.                      0.25%
                           ------------------------------------------------------------------------------------------------
                             B         Maximum 5.0% CDSC during the first year decreasing to 0%
                                       after six years.                                                         1.0%
                           ------------------------------------------------------------------------------------------------
                             C         1.0% CDSC during first year                                              1.0%
                           ------------------------------------------------------------------------------------------------
                             D         None                                                                     None
                           ------------------------------------------------------------------------------------------------
</TABLE>



                           CLASS A SHARES Class A shares are sold at net asset
                           value plus an initial sales charge of up to 5.25%.
                           The initial sales charge is reduced for purchases of
                           $25,000 or more according to the schedule below.
                           Investments of $1 million or more are not subject to
                           an initial sales charge, but are generally subject to
                           a contingent deferred sales charge, or CDSC, of 1.0%
                           on sales made within one year after the last day of
                           the month of purchase. The CDSC will be assessed in
                           the same manner and with the same CDSC waivers as
                           with Class B shares. Class A shares are also subject
                           to a distribution (12b-1) fee of up to 0.25% of the
                           average daily net assets of the Class.

                           The offering price of Class A shares includes a sales
                           charge (expressed as a percentage of the offering
                           price) on a single transaction as shown in the
                           following table:

FRONT-END SALES CHARGE OR FSC

An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges - the Combined Purchase Privilege, Right of Accumulation
and Letter of Intent.



<TABLE>
<CAPTION>
                                                                                FRONT-END SALES CHARGE
                                                                  --------------------------------------------------
                                                                      PERCENTAGE OF           APPROXIMATE PERCENTAGE
                           AMOUNT OF SINGLE TRANSACTION           PUBLIC OFFERING PRICE         OF AMOUNT INVESTED
                           -----------------------------------------------------------------------------------------
<S>                                                               <C>                         <C>
                           Less than $25,000                              5.25%                        5.54%
                           -----------------------------------------------------------------------------------------
                           $25,000 but less than $50,000                  4.75%                        4.99%
                           -----------------------------------------------------------------------------------------
                           $50,000 but less than $100,000                 4.00%                        4.17%
                           -----------------------------------------------------------------------------------------
                           $100,000 but less than $250,000                3.00%                        3.09%
                           -----------------------------------------------------------------------------------------
                           $250,000 but less than $1 million              2.00%                        2.04%
                           -----------------------------------------------------------------------------------------
                           $1 million and over                               0%                           0%
                           -----------------------------------------------------------------------------------------
</TABLE>

                           The reduced sales charge schedule is applicable to
                           purchases of Class A shares in a single transaction
                           by:

                           -  A single account (including an individual, trust
                              or fiduciary account).

                           -  Family member accounts (limited to husband, wife
                              and children under the age of 21).

                           -  Pension, profit sharing or other employee benefit
                              plans of companies and their affiliates.

                           -  Tax-exempt organizations.

                           -  Groups organized for a purpose other than to buy
                              mutual fund shares.



                                                                              13
<PAGE>   16
                           COMBINED PURCHASE PRIVILEGE. You also will have the
                           benefit of reduced sales charges by combining
                           purchases of Class A shares of the Fund in a single
                           transaction with purchases of Class A shares of other
                           Multi-Class Funds and shares of FSC Funds.

                           RIGHT OF ACCUMULATION. You also may benefit from a
                           reduction of sales charges, if the cumulative net
                           asset value of Class A shares of the Fund purchased
                           in a single transaction, together with shares of
                           other Funds you currently own which were previously
                           purchased at a price including a front-end sales
                           charge (including shares acquired through
                           reinvestment of distributions), amounts to $25,000 or
                           more. Also, if you have a cumulative net asset value
                           of all your Class A and Class D shares equal to at
                           least $5 million (or $25 million for certain employee
                           benefit plans), you are eligible to purchase Class D
                           shares of any Fund subject to the Fund's minimum
                           initial investment requirement.

                           You must notify your Morgan Stanley Dean Witter
                           Financial Advisor or other authorized financial
                           representative, (or Morgan Stanley Dean Witter Trust
                           FSB if you purchase directly through the Fund) at the
                           time a purchase order is placed, that the purchase
                           qualifies for the reduced charge under the Right of
                           Accumulation. Similar notification must be made in
                           writing when an order is placed by mail. The reduced
                           sales charge will not be granted if: (i) notification
                           is not furnished at the time of the order; or (ii) a
                           review of the records of Dean Witter Reynolds or
                           other authorized dealer of Fund shares or the Fund's
                           transfer agent does not confirm your represented
                           holdings.

                           LETTER OF INTENT. The schedule of reduced sales
                           charges for larger purchases also will be available
                           to you if you enter into a written "letter of
                           intent." A letter of intent provides for the purchase
                           of Class A shares of the Fund or other Multi-Class
                           Funds or shares of FSC Funds within a thirteen-month
                           period. The initial purchase under a letter of intent
                           must be at least 5% of the stated investment goal. To
                           determine the applicable sales charge reduction, you
                           may also include: (1) the cost of shares of other
                           Morgan Stanley Dean Witter Funds which were
                           previously purchased at a price including a front-end
                           sales charge during the 90-day period prior to the
                           distributor receiving the letter of intent, and (2)
                           the cost of shares of other Funds you currently own
                           acquired in exchange for shares of Funds purchased
                           during that period at a price including a front-end
                           sales charge. You can obtain a letter of intent by
                           contacting your Morgan Stanley Dean Witter Financial
                           Advisor or other authorized financial representative,
                           or by calling (800) 869-NEWS. If you do not achieve
                           the stated investment goal within the thirteen-month
                           period, you are required to pay the difference
                           between the sales charges otherwise applicable and
                           sales charges actually paid, which may be deducted
                           from your investment.

                           OTHER SALES CHARGE WAIVERS. In addition to
                           investments of $1 million or more, your purchase of
                           Class A shares is not subject to a front-end sales
                           charge (or a CDSC upon sale) if your account
                           qualifies under one of the following categories:

                           -  A trust for which Morgan Stanley Dean Witter Trust
                              FSB provides discretionary trustee services.

                           -  Persons participating in a fee-based investment
                              program (subject to all of its terms and
                              conditions, including mandatory sale or transfer
                              restrictions on termination) approved by the
                              Fund's distributor pursuant to which they pay an
                              asset based fee for investment advisory,
                              administrative and/or brokerage services.



14
<PAGE>   17
                           -  Employer-sponsored employee benefit plans, whether
                              or not qualified under the Internal Revenue Code,
                              for which Morgan Stanley Dean Witter Trust FSB
                              serves as trustee or Dean Witter Reynolds'
                              Retirement Plan Services serves as recordkeeper
                              under a written Recordkeeping Services Agreement
                              ("MSDW Eligible Plans") which have at least 200
                              eligible employees.

                           -  A MSDW Eligible Plan whose Class B shares have
                              converted to Class A shares, regardless of the
                              plan's asset size or number of eligible employees.

                           -  A client of a Morgan Stanley Dean Witter Financial
                              Advisor who joined us from another investment firm
                              within six months prior to the date of purchase of
                              Fund shares, and you used the proceeds from the
                              sale of shares of a proprietary mutual fund of
                              that Financial Advisor's previous firm that
                              imposed either a front-end or deferred sales
                              charge to purchase Class A shares, provided that:
                              (1) you sold the shares not more than 60 days
                              prior to purchase, and (2) the sale proceeds were
                              maintained in the interim in cash or a money
                              market fund.

                           -  Current or retired Directors/Trustees of the
                              Morgan Stanley Dean Witter Funds, such persons'
                              spouses and children under the age of 21, and
                              trust accounts for which any of such persons is a
                              beneficiary.

                           -  Current or retired directors, officers and
                              employees of Morgan Stanley Dean Witter & Co. and
                              any of its subsidiaries, such persons' spouses and
                              children under the age of 21, and trust accounts
                              for which any of such persons is a beneficiary.


                           CLASS B SHARES Class B shares are offered at net
                           asset value with no initial sales charge but are
                           subject to a contingent deferred sales charge, or
                           CDSC, as set forth in the table below. For the
                           purpose of calculating the CDSC, shares are deemed to
                           have been purchased on the last day of the month
                           during which they were purchased.

CONTINGENT DEFERRED SALES CHARGE OR CDSC

A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.

<TABLE>
<CAPTION>
                           YEAR SINCE PURCHASE                        CDSC AS A PERCENTAGE
                           PAYMENT MADE                                OF AMOUNT REDEEMED
                           ---------------------------------------------------------------
<S>                                                                   <C>
                           First                                              5.0%
                           ---------------------------------------------------------------
                           Second                                             4.0%
                           ---------------------------------------------------------------
                           Third                                              3.0%
                           ---------------------------------------------------------------
                           Fourth                                             2.0%
                           ---------------------------------------------------------------
                           Fifth                                              2.0%
                           ---------------------------------------------------------------
                           Sixth                                              1.0%
                           ---------------------------------------------------------------
                           Seventh and thereafter                             None
                           ---------------------------------------------------------------
</TABLE>


                           Each time you place an order to sell or exchange
                           shares, shares with no CDSC will be sold or exchanged
                           first, then shares with the lowest CDSC will be sold
                           or exchanged next. For any shares subject to a CDSC,
                           the CDSC will be assessed on an amount equal to the
                           lesser of the current market value or the cost of the
                           shares being sold.



                                                                              15
<PAGE>   18
                           CDSC WAIVERS. A CDSC, if otherwise applicable, will
                           be waived in the case of:

                           -  Sales of shares held at the time you die or become
                              disabled (within the definition in Section
                              72(m)(7) of the Internal Revenue Code which
                              relates to the ability to engage in gainful
                              employment), if the shares are: (i) registered
                              either in your name (not a trust) or in the names
                              of you and your spouse as joint tenants with right
                              of survivorship; or (ii) held in a qualified
                              corporate or self-employed retirement plan, IRA or
                              403(b) Custodial Account, provided in either case
                              that the sale is requested within one year of your
                              death or initial determination of disability.

                           -  Sales in connection with the following retirement
                              plan "distributions": (i) lump-sum or other
                              distributions from a qualified corporate or
                              self-employed retirement plan following retirement
                              (or, in the case of a "key employee" of a "top
                              heavy" plan, following attainment of age 59 1/2);
                              (ii) distributions from an IRA or 403(b) Custodial
                              Account following attainment of age 59 1/2; or
                              (iii) a tax-free return of an excess IRA
                              contribution (a "distribution" does not include a
                              direct transfer of IRA, 403(b) Custodial Account
                              or retirement plan assets to a successor custodian
                              or trustee).

                           -  Sales of shares held for you as a participant in a
                              MSDW Eligible Plan.

                           -  Sales of shares in connection with the Systematic
                              Withdrawal Plan of up to 12% annually of the value
                              of each Fund from which plan sales are made. The
                              percentage is determined on the date you establish
                              the Systematic Withdrawal Plan and based on the
                              next calculated share price. You may have this
                              CDSC waiver applied in amounts up to 1% per month,
                              3% per quarter, 6% semi-annually or 12% annually.
                              Shares with no CDSC will be sold first, followed
                              by those with the lowest CDSC. As such, the waiver
                              benefit will be reduced by the amount of your
                              shares that are not subject to a CDSC. If you
                              suspend your participation in the plan, you may
                              later resume plan payments without requiring a new
                              determination of the account value for the 12%
                              CDSC waiver.

                           All waivers will be granted only following the Fund's
                           distributor receiving confirmation of your
                           entitlement. If you believe you are eligible for a
                           CDSC waiver, please contact your Financial Advisor or
                           call (800) 869-NEWS.

                           DISTRIBUTION FEE. Class B shares are subject to an
                           annual 12b-1 fee of 1.0% of the net assets of Class
                           B.

                           CONVERSION FEATURE. After ten (10) years, Class B
                           shares will convert automatically to Class A shares
                           of the Fund with no initial sales charge. The ten
                           year period runs from the last day of the month in
                           which the shares were purchased, or in the case of
                           Class B shares acquired through an exchange, from the
                           last day of the month in which the original Class B
                           shares were purchased; the shares will convert to
                           Class A shares based on their relative net asset
                           values in the month following the ten year period. At
                           the same time, an equal proportion of Class B shares
                           acquired through automatically reinvested
                           distributions will convert to Class A shares on the
                           same basis. (Class B shares acquired in exchange for
                           shares of another Morgan Stanley Dean Witter Fund
                           originally purchased before May 1, 1997, however,
                           will convert to Class A shares in May 2007.)

                           In the case of Class B shares held in a MSDW Eligible
                           Plan, the plan is treated as a single investor and
                           all Class B shares will convert to Class A shares on
                           the conversion date of the Class B shares of a Morgan
                           Stanley Dean Witter Fund purchased by that plan.



16
<PAGE>   19
                           Currently, the Class B share conversion is not a
                           taxable event; the conversion feature may be
                           cancelled if it is deemed a taxable event in the
                           future by the Internal Revenue Service.

                           If you exchange your Class B shares for shares of a
                           Money Market Fund, a No-Load Fund, North American
                           Government Income Trust or Short-Term U.S. Treasury
                           Trust, the holding period for conversion is frozen as
                           of the last day of the month of the exchange and
                           resumes on the last day of the month you exchange
                           back into Class B shares.

                           EXCHANGING SHARES SUBJECT TO A CDSC. There are
                           special considerations when you exchange Fund shares
                           that are subject to a CDSC. When determining the
                           length of time you held the shares and the
                           corresponding CDSC rate, any period (starting at the
                           end of the month) during which you held shares of a
                           fund that does not charge a CDSC will not be counted.
                           Thus, in effect the "holding period" for purposes of
                           calculating the CDSC is frozen upon exchanging into a
                           fund that does not charge a CDSC.

                           For example, if you held Class B shares of the Fund
                           for one year, exchanged to Class B of another Morgan
                           Stanley Dean Witter Multi-Class Fund for another
                           year, then sold your shares, a CDSC rate of 4% would
                           be imposed on the shares based on a two year holding
                           period - one year for each Fund. However, if you had
                           exchanged the shares of the Fund for a Money Market
                           Fund (which does not charge a CDSC) instead of the
                           Multi-Class Fund, then sold your shares, a CDSC rate
                           of 5% would be imposed on the shares based on a one
                           year holding period. The one year in the Money Market
                           Fund would not be counted. Nevertheless, if shares
                           subject to a CDSC are exchanged for a fund that does
                           not charge a CDSC, you will receive a credit when you
                           sell the shares equal to the distribution (12b-1)
                           fees you paid on those shares while in that Fund up
                           to the amount of any applicable CDSC.

                           In addition, shares that are exchanged into or from a
                           Morgan Stanley Dean Witter Fund subject to a higher
                           CDSC rate will be subject to the higher rate, even if
                           the shares are re-exchanged into a Fund with a lower
                           CDSC rate.


                           CLASS C SHARES Class C shares are sold at net asset
                           value with no initial sales charge but are subject to
                           a CDSC of 1.0% on sales made within one year after
                           the last day of the month of purchase. The CDSC will
                           be assessed in the same manner and with the same CDSC
                           waivers as with Class B shares.

                           DISTRIBUTION FEE. Class C shares are subject to an
                           annual distribution (12b-1) fee of up to 1.0% of the
                           average daily net assets of that Class. The Class C
                           shares' distribution fee may cause that Class to have
                           higher expenses and pay lower dividends than Class A
                           or Class D shares. Unlike Class B shares, Class C
                           shares have no conversion feature and, accordingly,
                           an investor that purchases Class C shares may be
                           subject to distribution (12b-1) fees applicable to
                           Class C shares for an indefinite period.


                           CLASS D SHARES Class D shares are offered without any
                           sales charge on purchases or sales and without any
                           distribution (12b-1) fee. Class D shares are offered
                           only to investors meeting an initial investment
                           minimum of $5 million ($25 million for MSDW Eligible
                           Plans) and the following categories of investors:

                           -  Investors participating in the Investment
                              Manager's mutual fund asset allocation program
                              (subject to all of its terms and conditions,
                              including mandatory sale or transfer restrictions
                              on termination) pursuant to which they pay an
                              asset-based fee.



                                                                              17
<PAGE>   20
                           -  Persons participating in a fee-based investment
                              program (subject to all of its terms and
                              conditions, including mandatory sale or transfer
                              restrictions on termination) approved by the
                              Fund's distributor pursuant to which they pay an
                              asset based fee for investment advisory,
                              administrative and/or brokerage services.

                           -  Employee benefit plans maintained by Morgan
                              Stanley Dean Witter & Co. or any of its
                              subsidiaries for the benefit of certain employees
                              of Morgan Stanley Dean Witter & Co. and its
                              subsidiaries.

                           -  Certain unit investment trusts sponsored by Dean
                              Witter Reynolds.

                           -  Certain other open-end investment companies whose
                              shares are distributed by the Fund's distributor.

                           -  Investors who were shareholders of the Dean Witter
                              Retirement Series on September 11, 1998 for
                              additional purchases for their former Dean Witter
                              Retirement Series accounts.

                           MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the $5
                           million ($25 million for MSDW Eligible Plans) initial
                           investment to qualify to purchase Class D shares you
                           may combine: (1) purchases in a single transaction of
                           Class D shares of the Fund and other Morgan Stanley
                           Dean Witter Multi-Class Funds and/or (2) previous
                           purchases of Class A and Class D shares of
                           Multi-Class Funds and shares of FSC Funds you
                           currently own, along with shares of Morgan Stanley
                           Dean Witter Funds you currently own that you acquired
                           in exchange for those shares.


                           NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS If
                           you receive a cash payment representing an income
                           dividend or capital gain and you reinvest that amount
                           in the applicable Class of shares by returning the
                           check within 30 days of the payment date, the
                           purchased shares would not be subject to an initial
                           sales charge or CDSC.

                           PLAN OF DISTRIBUTION (RULE 12B-1 FEES) The Fund has
                           adopted a Plan of Distribution in accordance with
                           Rule 12b-1 under the Investment Company Act of 1940
                           with respect to the distribution of Class A, Class B
                           and Class C shares. The Plan allows the Fund to pay
                           distribution fees for the sale and distribution of
                           these shares. It also allows the Fund to pay for
                           services to shareholders of Class A, Class B and
                           Class C shares. Because these fees are paid out of
                           the Fund's assets on an ongoing basis, over time
                           these fees will increase the cost of your investment
                           in these Classes and may cost you more than paying
                           other types of sales charges.





18
<PAGE>   21
FINANCIAL HIGHLIGHTS




         The financial highlights table is intended to help you understand the
         Fund's financial performance for the period July 29, 1998 through May
         31, 1999. Certain information reflects financial results for a single
         Fund share. The total returns in the table represent the rate an
         investor would have earned or lost on an investment in the Fund
         (assuming reinvestment of all dividends and distributions).

         This information has been audited by PricewaterhouseCoopers LLP,
         independent accountants, whose report, along with the Fund's financial
         statements, is included in the annual report, which is available upon
         request.


<TABLE>
<CAPTION>
         CLASS B
         ------------------------------------------------------------------------------
                                                          FOR THE PERIOD JULY 29, 1998*
         SELECTED PER-SHARE DATA++:                            THROUGH MAY 31, 1999
         ------------------------------------------------------------------------------
<S>                                                       <C>
         Net asset value, beginning of period                     $     10.00
         ==============================================================================
         Income (loss) from investment operations:
            Net investment income (loss)                                (0.07)
            Net realized and unrealized gain                             1.76
         Total income from investment operations                         1.69
         ==============================================================================
         Net asset value, end of period                           $     11.69
         ==============================================================================
         TOTAL RETURN+(1)                                               16.90%
         ==============================================================================
         RATIOS TO AVERAGE NET ASSETS(2)(3):
         ------------------------------------------------------------------------------
         Expenses                                                        2.13%
         ------------------------------------------------------------------------------
         Net investment income (loss)                                   (0.68)%
         ==============================================================================
         SUPPLEMENTAL DATA:
         ------------------------------------------------------------------------------
         Net assets, end of period, in thousands                  $   273,345
         ------------------------------------------------------------------------------
         Portfolio turnover rate(1)                                        80%
         ------------------------------------------------------------------------------
</TABLE>

         *   Commencement of operations.

         ++  The per share amounts were computed using an average number of
             shares outstanding.

         +   Does not reflect the deduction of sales charge. Calculated based on
             the net asset value as of the last business day of the period.

         (1) Not annualized.

         (2) Annualized.

         (3) Reflects overall Fund ratios for investment income and non-class
             specific expenses.



                                                                              19
<PAGE>   22
<TABLE>
<CAPTION>
         CLASS A
         -----------------------------------------------------------------------------
                                                         FOR THE PERIOD JULY 29, 1998*
         SELECTED PER-SHARE DATA++:                          THROUGH MAY 31, 1999
         -----------------------------------------------------------------------------
<S>                                                      <C>
         Net asset value, beginning of period                     $   10.00
         =============================================================================
         Income (loss) from investment operations:
            Net investment income (loss)                               0.01
            Net realized and unrealized gain                           1.75
         Total income from investment operations                       1.76
         -----------------------------------------------------------------------------
         Net asset value, end of period                           $   11.76
         =============================================================================
         TOTAL RETURN+(1)                                             17.60%
         =============================================================================
         RATIOS TO AVERAGE NET ASSETS(2)(3):
         -----------------------------------------------------------------------------
         Expenses                                                      1.38%
         -----------------------------------------------------------------------------
         Net investment income (loss)                                  0.07%
         =============================================================================
         SUPPLEMENTAL DATA:
         -----------------------------------------------------------------------------
         Net assets, end of period, in thousands                  $   7,933
         -----------------------------------------------------------------------------
         Portfolio turnover rate(1)                                      80%
         -----------------------------------------------------------------------------
</TABLE>

         *   Commencement of operations.

         ++  The per share amounts were computed using an average number of
             shares outstanding.

         +   Does not reflect the deduction of sales charge. Calculated based on
             the net asset value as of the last business day of the period.

         (1) Not annualized.

         (2) Annualized.

         (3) Reflects overall Fund ratios for investment income and non-class
             specific expenses.

<TABLE>
<CAPTION>
         ---------------------------------------------------------------------------
         CLASS C
         ---------------------------------------------------------------------------
                                                       FOR THE PERIOD JULY 29, 1998*
         SELECTED PER-SHARE DATA++:                        THROUGH MAY 31, 1999
         ---------------------------------------------------------------------------
<S>                                                    <C>
         Net asset value, beginning of period                  $    10.00
         ===========================================================================
         Income (loss) from investment operations:
            Net investment income (loss)                            (0.04)
            Net realized and unrealized gain                         1.74
         Total income from investment operations                     1.70
         ---------------------------------------------------------------------------
         Net asset value, end of period                        $    11.70
         ===========================================================================
         TOTAL RETURN+(1)                                           17.10%
         ===========================================================================
         RATIOS TO AVERAGE NET ASSETS(2)(3):
         ---------------------------------------------------------------------------
         Expenses                                                    1.91%
         ---------------------------------------------------------------------------
         Net investment income (loss)                               (0.46)%
         ===========================================================================
         SUPPLEMENTAL DATA:
         ---------------------------------------------------------------------------
         Net assets, end of period, in thousands               $   15,744
         ---------------------------------------------------------------------------
         Portfolio turnover rate(1)                                    80%
         ---------------------------------------------------------------------------
</TABLE>

         *   Commencement of operations.

         ++  The per share amounts were computed using an average number of
             shares outstanding.

         +   Does not reflect the deduction of sales charge. Calculated based on
             the net asset value as of the last business day of the period.

         (1) Not annualized.

         (2) Annualized.

         (3) Reflects overall Fund ratios for investment income and non-class
             specific expenses.



20
<PAGE>   23
<TABLE>
<CAPTION>
         CLASS D
         ------------------------------------------------------------------------------------
                                                                FOR THE PERIOD JULY 29, 1998*
         SELECTED PER-SHARE DATA++:                                 THROUGH MAY 31, 1999
         ------------------------------------------------------------------------------------
<S>                                                             <C>
         Net asset value, beginning of period                              $10.00
         ====================================================================================
         Income (loss) from investment operations:
            Net investment income (loss)                                     0.03
            Net realized and unrealized gain                                 1.76
         Total income from investment operations                             1.79
         ------------------------------------------------------------------------------------
         Net asset value, end of period                                    $11.79
         ====================================================================================
         TOTAL RETURN+(1)                                                   17.90%
         ====================================================================================
         RATIOS TO AVERAGE NET ASSETS(2)(3):
         ------------------------------------------------------------------------------------
         Expenses                                                            1.13%
         ------------------------------------------------------------------------------------
         Net investment income (loss)                                        0.32%
         ====================================================================================
         SUPPLEMENTAL DATA:
         ------------------------------------------------------------------------------------
         Net assets, end of period, in thousands                           $   69
         ------------------------------------------------------------------------------------
         Portfolio turnover rate(1)                                            80%
         ------------------------------------------------------------------------------------
</TABLE>

         *   Commencement of operations.

         ++  The per share amounts were computed using an average number of
             shares outstanding.

         +   Does not reflect the deduction of sales charge. Calculated based on
             the net asset value as of the last business day of the period.

         (1) Not annualized.

         (2) Annualized.

         (3) Reflects overall Fund ratios for investment income and non-class
             specific expenses.



                                                                              21
<PAGE>   24
         NOTES




22
<PAGE>   25
         NOTES




                                                                              23
<PAGE>   26
         NOTES




24
<PAGE>   27
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS

                  The Morgan Stanley Dean Witter Family of Funds offers
                  investors a wide range of investment choices. Come on in and
                  meet the family!
- --------------------------------------------------------------------------------
GROWTH FUNDS

GROWTH FUNDS
Aggressive Equity Fund
American Opportunities Fund
Capital Growth Securities
Developing Growth Securities
Growth Fund
Market Leader Trust
Mid-Cap Equity Trust
Small Cap Growth Fund
Special Value Fund

THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities
Precious Metals and Minerals Trust

GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas" Portfolio
European Growth Fund
Fund of Funds - International Portfolio
International Fund
International SmallCap Fund
Japan Fund Latin American Growth Fund
Pacific Growth Fund
- --------------------------------------------------------------------------------
GROWTH AND INCOME FUNDS

Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Equity Fund
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Total Market Index Fund
Total Return Trust Value Fund
Value-Added Market Series/Equity Portfolio

THEME FUNDS
Global Utilities Fund
Real Estate Fund
Utilities Fund

GLOBAL FUNDS
Global Dividend Growth Securities
- --------------------------------------------------------------------------------
INCOME FUNDS

GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust

DIVERSIFIED INCOME FUNDS
Diversified Income Trust

CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund(NL)

GLOBAL INCOME FUNDS
North American Government Income Trust
World Wide Income Trust

TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust(FSC)
Limited Term Municipal Trust(NL)
Multi-State Municipal Series Trust(FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
- --------------------------------------------------------------------------------
MONEY MARKET FUNDS

TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund(MM)
U.S. Government Money Market Trust(MM)

TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust(MM)
New York Municipal Money Market Trust(MM)
Tax-Free Daily Income Trust(MM)

There may be Funds created after this Prospectus was published. Please consult
the inside back cover of a new Fund's prospectus for its designations, e.g.,
Multi-Class Fund or Money Market Fund.

Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
Short-Term U.S. Treasury Trust, is a Multi-Class Fund. A Multi-Class Fund is a
mutual fund offering multiple Classes of shares. The other types of Funds are:
NL -- No-Load (Mutual) Fund; MM -- Money Market Fund; FSC -- A mutual fund sold
with a front-end sales charge and a distribution (12b-1) fee.
<PAGE>   28
MORGAN STANLEY DEAN WITTER
EQUITY FUND



Additional information about the Fund's investments is available in the Fund's
Annual and Semi-Annual Reports to Shareholders. In the Fund's Annual Report, you
will find a discussion of the market conditions and investment strategies that
significantly affected the Fund's performance during its last fiscal year. The
Fund's Statement of Additional Information also provides additional information
about the Fund. The Statement of Additional Information is incorporated herein
by reference (legally is part of this Prospectus). For a free copy of any of
these documents, to request other information about the Fund, or to make
shareholder inquiries, please call:

                                 (800) 869-NEWS

You also may obtain information about the Fund by calling your Morgan Stanley
Dean Witter Financial Advisor or by visiting our Internet site at:

                          www.msdw.com/individual/funds

Information about the Fund (including the Statement of Additional Information)
can be viewed and copied at the Securities and Exchange Commission's Public
Reference Room in Washington, DC. Information about the Reference Room's
operations may be obtained by calling the SEC at (800) SEC-0330. Reports and
other information about the Fund are available on the SEC's Internet site
(www.sec.gov), and copies of this information may be obtained, upon payment of a
duplicating fee, by writing the Public Reference Section of the SEC, Washington,
DC 20549-6009.



                       (THE FUND'S INVESTMENT COMPANY ACT FILE NO. IS 811-49585)


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